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Triumph Question

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Post Mon Jul 21, 2008 8:56 am
Pa Site Admin

Posts: 5837
Location: Ohio USA

1968 Triumph Tiger, 12 volt system. Is it ok to use a pair of 6 volt coils with this 12 volt system, if one is to jump coils ? The cons ? The pro's ? Thanks in advance for any help, Pa

Post Wed Jul 23, 2008 8:43 am

Can't answer directly, but this is the best place to ask: ... /f/11.html

Post Wed Jul 23, 2008 10:52 am

Posts: 591
Location: Crewe, Great Britain

Hi Pa,

If it's an ignition like a H-D with a wasted spark, 2 cams for one set of points, it will probably work.

If one cam and 2 sets of points, 1 feed to both coils but 2 wires out to the points, it won't work...


Post Wed Jul 23, 2008 3:32 pm
Pa Site Admin

Posts: 5837
Location: Ohio USA

Thanks Panic and Patrick. The bike was purchased as is and it does run dual points with two separate 6 volt coils. No matter what we did with the two coils, we ended up with one dead cylinder. Since I asked this question, we installed a pair of 12 volt coils and electonic ignition. She is firing on both cylinders now. Pa

Post Mon Jul 28, 2008 3:08 am

Posts: 923
Location: South Provence of FRANCE

The BMWs of the 60 , 70 , 80 years are 12 Volts and run with two 6 Volts coils :D

Post Mon Jul 28, 2008 8:55 am

Posts: 2688
Location: Los Angeles, CA
While touring in Mexico back in the '60's, I forgot to turn off my ignition when we stopped at a cantina in the desert. This fried one set of points, condenser, and coil. I one lunged into Mexicali and all I could find was a Yamaha dealer. Well as it turned out Yamaha was producing a 650 Vertical Twin that bore a strange resemblance to a '50's Limey bike. I bought one set of points, condenser, and coil, and it all bolted in to my '67 Booneville. Bike fired right up and ran great. When I got back to LA I pulled the plugs and found that the Yammy side was burning much better than the Lucas side. So I was off to the local Yamaha dealer to buy the other set.

Post Sun Aug 10, 2008 8:45 pm

Posts: 66
Back when Gordon Jennings was at CYCLE they did a real eye opener of a coil test, and found that almost all foreign bikes were seriously under-coiled, and had borderline sparks which were responsible for much of their reputation for being hard to start etc. They did some miracle cures putting K-Mart Chevy coils on Ducatis, etc only to find out that in many cases they overloaded the electrical system. I built up a few coil systems for Vincents using the same coil, with greatly improved starting and low speed tractability.

BTW, there is often very little difference between a 6V and 12V coil. All coils are really 6v, and for 12 (or 24) they just add a ballast resistor to limit the current. GM traditionally used an external resistor, and Ford built them into the coil. So if you are stuck for a 6V coil, any 12V coil intended for use with an external resistor will work fine,

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